Chan Sek Keong SC SPMP DUT DUBC (born 5 November 1937)[1] is a Malaysian-Singaporean jurist who served as chief justice of Singapore between 2006 and 2012.

Along with his elder brother, Chan received his early education in King Edward VII School in Taiping.

Chan, unaware about the career prospects that a law degree could offer, heeded Etherton's advice and went for an interview conducted by Professor Lee Sheridan.

He graduated in 1961 and began his career with Messrs Bannon & Bailey in Kuala Lumpur as a pupil of Peter Mooney.

As soon as the legislation was passed, Chan applied to the Bar Council of Malaysia to ask for the period of pupillage he was required to serve to be shortened.

R. Ramani, a leading advocate and Chairman of the Bar Council, appeared personally to object to Chan's petition on the grounds that he had provided only one reason for abridgment of time when the relevant provision in the legislation referred to "reasons" (or "special grounds", the accurate wording used).

Ong ruled in Chan's favour, holding that the provision should be interpreted to include situations where there was only one reason for reducing the length of a pupillage stint.

Acting in this capacity in 1997, he submitted an opinion to the Singapore government that although the Parliamentary Elections Act forbade unauthorised persons to loiter within 200 metres of polling stations on polling day, this did not apply to unauthorised persons who were inside the stations.